Prepare the crust: combine the crushed graham crackers with the melted butter, press into the bottom of a springform pan, and refrigerate for 30 minutes.
Soak the gelatin sheets in cold water for 5 minutes to soften.
In a saucepan, heat the heavy cream, milk, and granulated sugar. Halve the vanilla bean lengthwise, scrape out the seeds, and add both the seeds and the pod to the mixture.
When the cream mixture is hot but not boiling, remove from the heat and stir in the thoroughly squeezed-out gelatin sheets until dissolved.
Let it cool slightly, then pour over the graham cracker crust. Return to the refrigerator for at least 4 hours, or until set.
Meanwhile, prepare the blueberry sauce: in a saucepan, bring the blueberries, powdered sugar, lemon juice, and water to a boil, then simmer for 5-7 minutes, or until thickened.
Let the blueberry sauce cool completely, then pour over the set panna cotta, spreading it evenly.
Refrigerate for an additional 1 hour to allow the blueberry layer to set.
Carefully remove the tart from the springform pan, garnish with fresh blueberries, and serve.
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